JPH05255521A - Brightened sheet rich in ultraviolet absorption capacity and production thereof - Google Patents

Abstract

PURPOSE:To obtain the title sheet which has a brightened color in the visible wavelength range and is free from yellowing even when the color is a pale one, by making a sheet retain a specific fluorescent compound and a specific ultraviolet-absorbing compound. CONSTITUTION:A sheet (e.g., cloth) is made to retain a fluorescent compound which absorbs ultraviolet rays with a wavelength of 300-400nm and emits them as visible light (e.g. C.I Fluorescent Brightening Agent 185) and an ultraviolet- absorbing compound which absorbs ultraviolet rays with a wavelength of 250-400nm, internally converts them into heat, and emits a heat energy (e.g. 2-(3-t-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole). The drawing shows examples of ultraviolet absorption by means of wavelength-reflectance graph (g).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processed sheet material having a high UV absorption property and a method for mass-producing such a sheet material. More specifically, nylon, polyester, acetate, acryl, urethane The present invention relates to a fiber product made of fibers such as cellulose and the like, and a technology for absorbing ultraviolet rays and improving the processing of synthetic resin sheet materials, and can be used in the field of clothing and industrial materials.

[0002]

2. Description of the Related Art An appropriate amount of long-wavelength ultraviolet light (320 to 400n)
m) is beneficial to the human body (for example, anti-Kurdish effect),
The sterilizing / disinfecting action is very useful for human life.

However, if the ultraviolet rays become too excessive, various harmful effects will be brought about. For example, even if the long-wavelength UV of 320 to 400 nm, which is said to be beneficial to the human body, is applied to the skin in an excessively large amount, it causes "blackening of the skin", "deposition of melanin pigment", "promotion of aging", and 290 to 290.
Mid-wavelength UV radiation of 320 nm is very dangerous because it may cause "skin erosion" and "retinal damage (snow eyes)", and short-wavelength UV radiation of 180 to 290 nm may cause "skin cancer". Particularly recently, as the ozone layer in the stratosphere has been depleted and the amount of short-wavelength UV radiation on the ground has increased, it is necessary to take UV protection measures for clothing and materials used outdoors. It was.

By the way, conventional measures against sheet materials such as cloths and synthetic resin films have been taken only by an extremely simple method of simply treating the material with an ultraviolet absorber. Therefore, the light-colored cloth has a low ultraviolet absorption effect, and there is a problem that the yellowing is noticeable or the hue is smoldered especially in the case of an ultra-light-colored cloth such as white.

However, when an ultraviolet absorber made of an inorganic compound such as zinc oxide, which is also used as a white pigment, or an ultraviolet absorber made of an organic compound such as anilide oxalate, yellowing is less likely to occur. However, there is a drawback that the ultraviolet absorption effect is low and the intended purpose cannot be achieved.

The present invention has been made in view of the above-mentioned problems in the technique for preventing ultraviolet rays in a cloth or a synthetic resin sheet, and has the ability to efficiently absorb ultraviolet rays and further Going one step further, by converting the wavelength of the absorbed ultraviolet rays, the colors in the visible wavelength region become outstanding,
Providing a new method that can industrially produce a processed sheet material that does not cause a yellowing phenomenon even if it is a light-colored color, and a sheet material that has a dramatically different color compared to conventional products Is a technical issue.

[0007]

In order to solve the above technical problems, the present inventor has conducted trial and error in an experiment for enhancing the ultraviolet absorptivity of a cloth and a synthetic resin sheet using various ultraviolet absorptive compounds. However, in addition to a fluorescent compound that absorbs ultraviolet light in the long wavelength region and converts it to the short wavelength side of the visible wavelength region, it also absorbs ultraviolet light from the short wavelength region to the long wavelength region and internally converts it into heat energy. When used in combination with a water-soluble compound, the ultraviolet absorption becomes extremely large, and the amount of radiated light in the short wavelength region in the visible wavelength region increases dramatically, without causing yellowing or smoldering of the hue. We have found the fact that there is a significant increase in freshness.

The present invention is intended to solve the technical problem of the present application by utilizing the phenomenon of increasing the amount of radiated light based on such knowledge, and absorbs ultraviolet rays in the range of 300 to 400 nm to reach the visible wavelength range. It has a high UV absorptivity by holding a fluorescent compound which is wavelength-converted and emitted, and an UV absorptive compound which internally absorbs UV rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it into a sheet. The gist lies in the fact that it is made into a processed sheet.

Further, according to the present invention, when the sheet-like material is a fiber structure, a fluorescent compound which absorbs ultraviolet rays in the range of 300 to 400 nm, converts the wavelength into the visible wavelength range and emits it, and a range of 250 to 400 nm. UV absorbing compound that absorbs UV rays and internally converts it to heat energy and emits it, by applying processing means such as dyeing or coating or spraying to the sheet-like fiber structure by dyeing processing, it is highly UV absorbing The gist of the manufacturing method lies in the fact that it is possible to industrially mass-produce the expanded fiber sheet.

Further, in the present invention, when the sheet material is made of a synthetic resin, a fluorescent compound which absorbs ultraviolet rays in the range of 300 to 400 nm, converts the wavelength into the visible wavelength range and emits it, and 250 to 400 nm. The ultraviolet absorbing compound that absorbs the ultraviolet rays of the above and internally converts it into heat energy and emits it is mixed with a synthetic resin molding material and then formed into a sheet-like kneading means, or the fluorescent material is used. A treatment solution containing both a compound and an ultraviolet-absorbing compound is prepared, and a dyeing processing means is used in which a synthetic resin sheet is bathed in the treatment solution for dyeing. The gist of the manufacturing method lies in that the synthetic resin sheet can be industrially mass-produced.

However, the fluorescent compound that can be used in the present invention must have the property of absorbing long-wavelength ultraviolet light in the range of 300 to 400 nm and converting the wavelength to the short wavelength side of the visible wavelength range to emit light. There are, as specific examples, stilbene, coumarin, pyrazoline, imidazolone, imidazole, oxazole, triazole, naphthalimide, azo (benzeneazo, naphthaleneazo, heterocyclic azo), carbonium (diphenylmethane, triphenylmethane, xanthene, acridine) in the skeleton, Examples thereof include compounds having aminoketone, hydroxyketone, and anthraquinone. Since these fluorescent compounds absorb long-wavelength ultraviolet rays and convert them into a visible wavelength region to emit light, they are effective for yellowing and smoldering in ultra-light colors such as white.

Next, as the ultraviolet absorbing compound which can be used in the present invention, it is possible to absorb ultraviolet rays in the range of 250 to 400 nm, rapidly excite the molecules of the sheet-like substance into an excited state, convert it into heat energy and release it. Is required
Specific examples thereof include compounds having skeletons of benzotriazole, benzophenone and diphenyl acrylate.

[0013]

As described above, the fluorescent compound that emits light by converting the wavelength of long-wavelength ultraviolet light, and the ultraviolet light in a wide range from the short-wavelength ultraviolet region to the long-wavelength ultraviolet region are absorbed and converted into heat energy. When the sheet-like material retains the UV-absorbing compound to be emitted, the UV-absorbing performance becomes extremely large, and due to the synergistic action of the fluorescent compound and the UV-absorbing compound, the light emission amount in the short wavelength part in the visible wavelength region is significantly increased. It will increase to.

EXAMPLES The specific contents of the present invention will be described below with reference to examples.

[Example 1] Polyester taffeta was subjected to high-pressure dyeing with a dyeing solution having the following mixing ratio at a bath ratio of 1:10 and a temperature of 130 ° C for 60 minutes to obtain a prototype 1. Yellow dye (CI Disperse Yellow 64) 0.02w% Fluorescent compound (CI Fluorescent Brightening Agent 185) 2.00w% UV absorbing compound 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole 0.30w%

[Comparative Product 1] The same polyester taffeta as in the above Example product was blended with 0.02w% of the yellow dye and 0.30w% of the ultraviolet absorbing compound to prepare a dye liquor, and a bath ratio of 1: Comparative product 1 was obtained by high-pressure dyeing at a temperature of 130 ° C. for 60 minutes.

[Comparative Product 2] The same polyester taffeta as in the above Example product was subjected to high pressure dyeing at a bath ratio of 1:10 at a temperature of 130 ° C. for 60 minutes with a dye liquor containing 0.02% by weight of the yellow dye in Example 1 for comparison. Item 2 was obtained.

Prototype 1 obtained in Example 1 and comparative product 1
The difference in reflectance from No. 2 is represented by a wavelength-reflectance graph as shown in FIG. As shown in FIG. 1, in the prototype of Example 1, as compared with Comparative Products 1 and 2, 360 to 40
The reflectance is low in the ultraviolet region at 0 nm and the short wavelength visible region at 400 to 420 nm (purple / blue / green).
The fact that the reflectance in the visible wavelength range of 20 to 500 nm (yellowish green / yellow / orange) is significantly high is remarkable. This is irreversible, and it means that the polyester taffeta (Prototype 1) treated in Example 1 emphasizes the sharpness of color in the yellow-green to orange region.

The above-mentioned reflectance comparison graph is obtained by using a Macbeth MS-2020 spectrophotometer and a "UV-IN" (including ultraviolet energy) light source for light having a wavelength of 360 to 740 nm every 20 nm. Was measured and graphed, and the reflectance tests of the examples and comparative products of the present invention were all conducted by the same method.

Next, the transmittance of ultraviolet rays of the prototype obtained in Example 1 and the comparative products 1 and 2 was measured by the sunburn sensor method, and the following results were obtained. [UV transmittance] Prototype 1 (Example 1) 3.0% Comparative product 1 6.2% Comparative product 2 25.6%

The ultraviolet transmittance is calculated by covering the sensor light receiving portion of an ultraviolet intensity integrating meter (SUV-T type: manufactured by Toray Techno Co., Ltd.) called a sunburn sensor with a sample cloth and 10 mW / cm 2.
² lamp (surface inspection lamp: manufactured by Funakoshi Co., Ltd.) is turned on, the time required for 0.1 J / cm ² is calculated with the mode as an integrated value, and the ratio with the blank value similarly calculated is calculated to obtain the transmittance. I asked. This method of measuring the ultraviolet transmittance was also used for the transmittance test in other examples of the present invention.

[Example 2] A polyester / cotton knitted fabric (ratio 65/35) was treated with a treating solution having the following blending ratio to give a bath ratio of 1:
10. Prototype 2 was obtained by dyeing at a temperature of 130 ° C. for 60 minutes under high pressure. Fluorescent compound (CI Fluorescent Bri
ghtening Agent 90) 1.0} w% UV absorbing compound 2
-(3-t-Butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole 1.0 w%

[Comparative product 3] Dyeing a polyester / cotton knit fabric (ratio 65/35) with a treatment liquid containing 1.0 w% of the above-mentioned ultraviolet absorbing compound at a bath ratio of 1:10 and a temperature of 130 ° C. for 60 minutes under high pressure. Comparative product 3 was obtained after the treatment.

The difference in reflectance between the prototype 2 obtained in Example 2 above, the comparative product 3 and the untreated product (polyester / cotton knit: ratio 65/35) is shown in the wavelength-reflectance graph of FIG. Represented by. Referring to FIG. 2, comparing the prototype of Example 2 with the comparative product 3, the reflectance of the former is slightly lower in the wavelength region of 420 nm or less, in other words, the former has a good ultraviolet absorption rate. However, both of them have an excellent ultraviolet absorption rate compared with the untreated product. But 420 nm
The reflectance in the short-wavelength region of visible wavelengths exceeding the value of the prototype of Example 2 was higher than that of Comparative Product 3, and further 43
In the wavelength range of 0 to 480 nm, the fact that the reflectance in the visible wavelength range (yellowish green / yellow / orange) is significantly higher than that of the comparative product 3 and the untreated product is clearly shown. However, this is because the ultraviolet rays absorbed in the wavelength region of 420 nm or less are efficiently wavelength-converted, and 430 to 480
It can be inferred that the visible light of nm is emitted.

Next, the ultraviolet transmittance of the prototype obtained in Example 2 above, the comparative product 3 and the untreated product was measured by the sunburn sensor method, and the following results were obtained. [UV transmittance] Prototype 2 (Example 2) 3.0% Comparative product 3 3.7% Untreated product 23.9%

Example 3 A polyester woven fabric was padded with an aqueous solution having the following composition, squeezed with a mangle at a pick-up rate of 30%, dried at 110 ° C. for 5 minutes, and at 170 ° C.
Curing was performed for 30 seconds to obtain prototype 3. Fluorescent compound (CI Fluorescent Brightening Agent 185) 3.0}% Ultraviolet absorbing compound (2,2'-dihydroxy-4,4'-dimethoxybenzophenone 1.0% Acrylic resin 3.0}%

[Comparative product 4] A polyester woven fabric was padded with an aqueous solution containing 1.0% of the above ultraviolet absorbing compound and 3.0% of the above acrylic resin, and squeezed with a mangle at a pickup rate of 30%, and then at 110 ° C. Dry for 5 minutes at 170 ℃ 30
Comparative product 4 was obtained after curing for 2 seconds.

[Comparative product 5] A polyester woven fabric was padded with an aqueous solution containing 3.0% of the above acrylic resin, squeezed with a mangle at a pickup rate of 30%, and then 110
Comparative product 5 was obtained by drying at 5 ° C for 5 minutes and curing at 170 ° C for 30 seconds.

The difference in reflectance between the prototype 3 obtained in Example 3 and the comparative products 4 and 5 is shown in the wavelength-reflectance graph of FIG. Referring to FIG. 3, comparing the prototype 3 of Example 3 with the comparative product 4, the reflectance of the former is slightly low in the wavelength region of 410 nm or less. In other words, the former has ultraviolet rays. Although the good absorptivity is recognized, both have excellent ultraviolet absorptivity with the comparative product 5.
However, the reflectance in the short wavelength region of visible wavelengths exceeding 420 nm is significantly higher in prototype 3 than in comparative product 4, and when it reaches the wavelength region of 430 to 480 nm, comparative product 4 and comparative product The fact that the reflectance in the visible wavelength range (yellow-green / yellow / orange) is extremely higher than that of No. 5 clearly appears. This is 420 nm
It is speculated that this is because the ultraviolet rays absorbed in the following wavelength regions are efficiently converted in wavelength and emitted as visible light of 430 to 480 nm.

Next, the ultraviolet transmittance of the prototype obtained in Example 3 and the comparative products 4 and 5 was measured by a sunburn sensor method, and the following results were obtained. [Ultraviolet transmittance] Prototype 3 (Example 3) 10.9% Comparative product 4 12.9% Comparative product 5 27.5%

Example 4 A release paper was coated with the following synthetic resin mixture liquid with a bar coater and dried with hot air at 90 ° C. for 2 minutes, and then the release paper was peeled off to remove a film having a film thickness of 25 μm (test sample). I got the work 4). Fluorescent compound (CI Fluorescent Brightening Agent 90) 0.05 part Ultraviolet absorbing compound 2- [2'-hydroxy-3 '-(3 ", 4", 5 ", 6" -tetra-hydrophthalimidomethyl) -5 '− Methylphenyl] benzotriazole 0.05 part Ester urethane resin 100 parts Methyl ethyl ketone 30 parts

Comparative product 6 A release liner was coated on a release paper with a bar coater to obtain the above-mentioned UV absorbing compound 0.0
Apply 5 parts, 100 parts of ester-based urethane resin, 30 parts of methyl ethyl ketone to a synthetic resin mixture, and apply at 90 ° C for 2
After hot-air drying for a minute, the release paper was peeled off to obtain a film (Comparative Product 6) having a film thickness of 25 μm.

[Comparative product 7] 100 parts of the above ester-based urethane resin and methyl ethyl ketone were placed on a release paper with a bar coater.
Apply synthetic resin compounding liquid containing 30 parts and
After hot-air drying for a minute, the release paper was peeled off to obtain a film (Comparative Product 7) having a film thickness of 25 μm.

The difference in reflectance between the prototype 4 obtained in Example 4 and the comparative products 6 and 7 is shown in the wavelength-reflectance graph of FIG. Referring to this FIG. 4, when the prototype 4 of the example 4 is compared with the comparative product 6 and the comparative product 7, it is 36
UV region from 0 to 400 nm and 400 to 430 n
In the short wavelength range of m (purple / blue / green), the reflectance of the former is significantly low, and in the visible wavelength range of 430 to 500 nm (yellow-green / yellow / orange / red) is extremely high. The fact is appearing. In the prototype 4 obtained in Example 4, the color sharpness in the yellow-green / yellow / orange / red regions was emphasized, and the purple color in the short-wavelength region was emphasized. -It means that colors such as blue and green appear to be sunk, and the warm colors are exaggerated as a whole.

Next, the prototype 4 obtained in Example 4 above,
When the ultraviolet transmittances of the comparative product 6 and the comparative product 7 were measured by the sunburn sensor method, the following results were obtained. [Ultraviolet transmittance] Prototype 4 (Example 4) 9.4% Comparative product 6 22.9% Comparative product 7 79.2%

Regarding the moisture permeability and the water pressure resistance, the following is a comparison between the prototype 4, the comparative product 6 and the comparative product 7. Permeability (JIS Z 0208) Water resistance (JIS 1004-78) Prototype 4 5,800 g / m ² / 24hr 2,200 mm / sec Comparative product 6 5,866 g / m ² / 24hr 2,198 mm / sec Comparative product 7 5,883 g / m ² / 24hr 2,195 mm / sec

Example 5 A polyester film having a thickness of 25 μ was treated with a treating solution having the following composition ratio at a bath ratio of 1:50 and a temperature of 130.
Prototype 5 was obtained by performing dyeing treatment at high pressure for 60 minutes. Fluorescent compound (CI Fluorescent Brightening Agent 185) 1.0 w% UV absorbing compound 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole 2.0 w%

[Comparative product 8] A polyester film having a thickness of 25 μ was treated with a treating solution containing 2.0 w% of the same compound as the ultraviolet absorbing compound used in Example 5 at a bath ratio of 1:50 and a temperature of 130 ° C. for 60 minutes. Comparative product 8 was obtained by dyeing at high pressure.

Prototype 5 obtained in Example 5 above and comparative product 8
The difference in reflectance from the untreated polyester film having a thickness of 25 μ and not subjected to any treatment is shown in the wavelength-reflectance graph of FIG. When the prototype 5 obtained in Example 5 is compared with the comparative product 8 and the untreated product with reference to FIG. 5, the former reflection is higher than that of the comparative product 8 in the wavelength region of 425 nm or less. Although the rate is slightly lower, in other words, the former has a good ultraviolet absorption rate, but both the prototype 5 and the comparative product 8 have a markedly higher ultraviolet absorption rate than the untreated product. However, in the visible wavelength range of 425 to 500 nm, the prototype 5 obtained in Example 5 exhibits higher reflectance than the comparative product 8. It can be presumed that this is that visible wavelengths and ultraviolet rays absorbed in the wavelength region of 425 nm or less are wavelength-converted and emitted as visible rays of 425 to 500 nm.

Next, the ultraviolet transmittance of the prototype 5 obtained in Example 5 above, the comparative product 8 and the untreated product was measured by the sunburn sensor method, and the following results were obtained. [UV transmittance] Prototype 5 4.5% Comparative product 8 8.0% Untreated product 71.8%

The "extended processed sheet material rich in ultraviolet absorption" which is the object of the present invention can be obtained almost as in the above-mentioned embodiment, but the present invention is by no means limited to the above-mentioned embodiment. Needless to say, various modifications can be made within the scope of the "Claims". For example, a sheet-like material to which the present invention is applied is a knitted fabric or a non-woven fabric other than a fabric, and a conventionally known synthetic resin sheet in general. It is also possible to target, and also as a processing means for holding the fluorescent compound and the ultraviolet absorbing compound in these sheet-like materials, in addition to the dyeing method, a kneading method, a coating method, a spray coating method, It is possible to select and apply electrostatic coating methods.

[0041]

As described above with reference to the examples, according to the present invention, the sheet-like material contains a fluorescent compound capable of absorbing ultraviolet rays in the long wavelength region and converting the wavelength to the short wavelength side in the visible wavelength region. , A UV-absorbing compound that absorbs UV rays from the short-wavelength region to the long-wavelength region and internally converts it into heat energy is held together, so it was made using such a sheet-like material. Wearing clothes has a very good effect of absorbing ultraviolet rays, so it can protect the skin from harmful ultraviolet rays, and also reduces the reflection of ultraviolet rays, which reduces irritation to the retina and is also favorable for health. The result is obtained.

Further, in the processed sheet material obtained by applying the present invention, the amount of radiated light in the short wavelength portion in the visible wavelength region is remarkably increased, and yellowing or hue smoldering may occur. Therefore, it can be said that it is particularly suitable as a material for clothing, such as ski wear and swimwear, which requires fashionability, because the remarkable effect of increasing the freshness is achieved.

Further, since the present invention can be applied to synthetic resin sheets, it can be used as a countermeasure against ultraviolet rays and a perishing processing technique for tents, beach parasols, other outdoor equipment products, building materials, etc. used outdoors where the ultraviolet rays are strong. Is also very effective.

Furthermore, since the present invention can be applied to a moisture permeable film, it is possible to add a new function of an ultraviolet ray shielding function to a covering material such as a mountain climbing cloth or ski wear cloth.

As described above, according to the present invention, the problems such as yellowing and hue smoldering, which have not been solved by the prior art, can be greatly improved, and the commercialization and implementation thereof can be extremely simple and inexpensive. Yes, its industrial utility value is extremely high.

[Brief description of drawings]

1 is a wavelength-reflectance graph showing the ultraviolet absorption performance of the prototype obtained in Example 1 in contrast.

FIG. 2 is a wavelength-reflectance graph showing the ultraviolet absorption performance of the prototype obtained in Example 2 in contrast.

FIG. 3 is a wavelength-reflectance graph showing the ultraviolet absorption performance of the prototype obtained in Example 3 in contrast.

FIG. 4 is a wavelength-reflectance graph showing the ultraviolet absorption performance of the prototype obtained in Example 4 in contrast.

FIG. 5 is a wavelength-reflectance graph showing the ultraviolet absorption performance of the prototype obtained in Example 5 in contrast.

Claims (7)

[Claims] 1. A fluorescent compound that absorbs ultraviolet rays in the range of 300 to 400 nm and converts the wavelength into the visible wavelength range and emits it, and ultraviolet rays that absorbs ultraviolet rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it. A processed sheet material having a high UV-absorbing property, characterized in that an absorbent compound is held on the sheet material. 2. The processed and processed sheet material having a high ultraviolet absorption property according to claim 1, wherein the sheet material is a fiber structure such as a fabric, a knitted fabric or a non-woven fabric. 3. The processed and processed sheet material having a high degree of ultraviolet absorption according to claim 1, wherein the sheet material is a synthetic resin sheet. 4. A fluorescent compound that absorbs ultraviolet rays in the range of 300 to 400 nm and converts the wavelength into the visible wavelength range and emits it, and ultraviolet rays that absorbs ultraviolet rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it. A method for producing a freshly processed sheet-like product rich in ultraviolet absorption, which comprises dyeing a sheet-like fiber structure with a dye-absorbing compound. 5. A fluorescent compound that absorbs ultraviolet rays in the range of 300 to 400 nm and converts the wavelength into the visible wavelength range and emits it, and ultraviolet rays that absorbs ultraviolet rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it. A method for producing a processed sheet material having a high UV-absorbing property, which comprises applying an absorbing compound to the surface of a sheet-shaped fiber structure by a method such as coating or spraying. 6. A fluorescent compound that absorbs ultraviolet rays in the range of 300 to 400 nm and converts the wavelength into the visible wavelength range and emits it, and ultraviolet rays that absorbs ultraviolet rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it. A method for producing a processed sheet material having a high ultraviolet-absorbing property, which comprises mixing an absorbent compound into a synthetic resin molding material, and then molding the material into a sheet shape. 7. A fluorescent compound that absorbs ultraviolet rays in the range of 300 to 400 nm and converts the wavelength into the visible wavelength range and emits it, and ultraviolet rays that absorbs ultraviolet rays in the range of 250 to 400 nm and internally converts it into heat energy and emits it. 1. A method for producing a processed sheet material having a high UV-absorbing property, which comprises preparing a treatment liquid containing both absorbing compounds and subjecting the treatment liquid to a bath of a synthetic resin sheet for dyeing.